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<blockquote data-quote="Irlo" data-source="post: 8590292" data-attributes="member: 7028372">Disclaimer: What follows, sparked by the comment quoted below from another thread, is meant to be a good-natured digression and exploration of spell mechanics and is not intended to challenge anyone's interpretation of RAW. It's ridiculously pedantic and should be taken in that spirit.EDIT: I'm a DM.&nbsp; I know what my ruling would be. This is a theoretical discussion about how folks on the forum interpret spell mechanics. Thanks!The spell invisibility is not instantaneous in duration, nor are the spell effects specified to be instant. Can I cast a readied magic missile to use when the target begins to turn invisible? Why or why not?YES. It takes only a fraction of a second to use a spell as a reaction. The invisibility spell does not specifically state that the invisible condition is applied instantly, so there is some small but perceptible duration of time after completion of spell that the target is visible and fading away. Plus, I like the idea of a quick but gradual fade-away as the magic kicks in.NO. The magic missile spell is only valid on a target that the caster can see. Spell effects occur instantly upon competion of the spell unless stated otherwise, and don't require an instantaneous label or descriptor to be instantaneous. [Is there a rule to that effect, or is it just a reasonable ruling on the part of the DM?]</blockquote>

[QUOTE="Irlo, post: 8590292, member: 7028372"] Disclaimer: What follows, sparked by the comment quoted below from another thread, is meant to be a good-natured digression and exploration of spell mechanics and is not intended to challenge anyone's interpretation of RAW. It's ridiculously pedantic and should be taken in that spirit. EDIT: I'm a DM. I know what my ruling would be. This is a theoretical discussion about how folks on the forum interpret spell mechanics. Thanks! The spell [I]invisibility[/I] is not instantaneous in duration, nor are the spell effects specified to be instant. Can I cast a readied [I]magic missile[/I] to use when the target[I] begins[/I] to turn invisible? Why or why not? YES. It takes only a fraction of a second to use a spell as a reaction. The [I]invisibility[/I] spell does not specifically state that the [I]invisible[/I] condition is applied instantly, so there is some small but perceptible duration of time after completion of spell that the target is visible and fading away. Plus, I like the idea of a quick but gradual fade-away as the magic kicks in. NO. The [I]magic missile[/I] spell is only valid on a target that the caster can see. Spell effects occur instantly upon competion of the spell unless stated otherwise, and don't require an [I]instantaneous[/I] label or descriptor to be instantaneous.[I] [Is there a rule to that effect, or is it just a reasonable ruling on the part of the DM?][/I] [/QUOTE]

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